A micro-nano silica anti-agglomeration spray drying device and process

Abstract

The present invention discloses a micro-nano silica anti-agglomeration spray drying device, which relates to the technical field of silica preparation. It includes a spray drying tank and a centrifugal sprayer arranged at the top inside the spray drying tank. A rotating shell is rotatably connected to the inner top surface of the spray drying tank. A number of horizontal air pipes are annularly arranged on the side of the rotating shell. One end of the horizontal air pipe is communicated with a vertical air pipe that slides along the inner wall of the spray drying tank. A number of U-shaped plates are equidistantly fixed from top to bottom on one side of the vertical air pipe. A first gear is rotatably connected to the outer side wall of the U-shaped plate, and one end of the first gear extends into the U-shaped plate. The filter cotton ensures that hot air can pass through. When the horizontal air pipe rotates, a wind area is formed in the top area inside the spray drying tank, which can prevent the silica mist from contacting the top surface of the spray drying tank. And the set filter cotton can effectively reduce the wind speed and will not cause turbulence due to too high wind speed.

Description

Technical Field

[0001] The present invention relates to the technical field of silica preparation, and in particular to a micro-nano silica anti-agglomeration spray drying device. Background Art

[0002] Silica is a general term for white powder X-ray amorphous silicic acid and silicate products. It has been found that adding silica to solution-polymerized styrene-butadiene rubber can ensure the balance among the rolling resistance, wear resistance and anti-slip performance of automobile tires made of solution-polymerized styrene-butadiene rubber. That is to say, when any one variable of the tread rubber is changed to improve a certain performance, the other two performances will be appropriately adjusted to the best state.

[0003] When using a spray dryer to spray-dry the prepared silica solution, air passes through a filter and then enters the hot air circulation system to heat the air to a specified temperature. The heated air then reaches the air distributor at the top of the spray dryer, and the hot air enters the drying tower interior in a spiral shape. The spiral hot air can not only ensure the stable flow direction of the sprayed silica mist, but also ensure that the dried silica particles enter the bottom of the dry atomization drying cylinder and are discharged.

[0004] In the actual use process, the angle of the spiral hot air is fixed, that is, the residence time of the silica mist in the drying cylinder is fixed. Therefore, when the amount of the atomized silica sprayed by the centrifugal sprayer increases, due to the fixed angle of the spiral hot air, the silica in the middle part of the sprayed cone is discharged from the bottom receiving mechanism without being fully dried, resulting in insufficient drying of the finally collected silica. Summary of the Invention

[0005] The purpose of the present invention is to reduce the influence brought by the above situation, and to provide a micro-nano silica anti-agglomeration spray drying device.

[0006] To achieve the above object, the present invention adopts the following technical solution: A micro-nano silica anti-agglomeration spray drying device, including a spray drying tank and a centrifugal sprayer arranged at the top inside the spray drying tank. A rotating shell is rotatably connected to the inner top surface of the spray drying tank. A plurality of horizontal air pipes are annularly arranged on the side of the rotating shell. One end of each horizontal air pipe is communicated with a vertical air pipe that slides along the inner wall of the spray drying tank. A plurality of U-shaped plates are fixedly arranged at equal intervals from top to bottom on one side of the vertical air pipe. A first gear is rotatably connected to the outer side wall of one U-shaped plate. One end of the first gear extends into the U-shaped plate and is fixedly connected with an air outlet nozzle. The air outlet nozzle is rotatably connected to the inner wall of the U-shaped plate, and the air outlet nozzle is communicated with the inside of the vertical air pipe through a hose. A rack that meshes with a plurality of first gears is slidably connected to one side of the vertical air pipe. The bottom surface of the rack is fixedly connected with a connecting block, and the bottom surface of the connecting block is fixedly connected with an annular slide rail. The slide rail is sleeved on the guide rail. The guide rail rises / falls along the height direction of the spray drying tank according to the amount of the atomized silica ejected by the centrifugal sprayer.

[0007] Further: An air cavity is opened at the top inside the spray drying tank. An air duct for connecting a hot air circulation system is opened on the cavity wall of the air cavity, and a connecting cavity communicating with the spray drying tank is opened at the bottom of the air cavity.

[0008] Further: A fan is arranged in the air duct. A universal joint is arranged on one side of the air cavity close to the air duct. One end of the universal joint is located in the air cavity, and belt pulleys are arranged on both the fan blade shaft and one end of the universal joint. The two belt pulleys are driven by a belt. The other end of the universal joint extends into the rotating shell through the connecting cavity and is fixedly connected with a second gear that meshes with the inner wall of the rotating shell.

[0009] Further: One ends of both the fan and the universal joint are rotatably connected through the cavity wall of the air cavity, and the other end of the universal joint is rotatably connected through the inner wall of the connecting cavity.

[0010] Further: The cross-section of the inner wall of the guide rail is T-shaped, and a plurality of electric push rods for pushing the guide rail to rise and fall are annularly arranged at the bottom of the spray drying tank.

[0011] A micro-nano silica anti-agglomeration spray drying process includes the following steps:

[0012] S1. Centrifugally process the silica solution through the centrifugal sprayer on the spray drying tank to obtain atomized silica.

[0013] S2. Dry the obtained atomized silica by rotating the vertical air pipe and the horizontal air pipe and spraying spiral hot air to obtain dried silica particles, and discharge them from the discharge port at the bottom of the spray drying tank; The drying process specifically includes the following process;

[0014] When the amount of fumed silica sprayed by the centrifugal sprayer is large, the telescopic end of the electric push rod contracts, the guide rail descends, driving the slide rail and the rack to descend, driving the first gear meshed with the rack to rotate, and the rotation of the first gear drives the air outlet nozzle to rotate upward, realizing a decrease in the inclination of the spiral hot air blown out, increasing the number of rotation circles of the spiral hot air in the spray dryer, that is, extending the residence time of the fumed silica in the spray drying tank;

[0015] When the amount of fumed silica sprayed by the centrifugal sprayer is small, the telescopic end of the electric push rod extends, the guide rail ascends, driving the slide rail and the rack to ascend, driving the first gear meshed with the rack to rotate in the reverse direction, and the rotation of the first gear drives the air outlet nozzle to rotate downward, realizing an increase in the inclination of the spiral hot air, reducing the number of rotation circles of the spiral hot air in the spray dryer, that is, shortening the residence time of the fumed silica in the spray drying tank.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows.

[0017] In the present invention, when the amount of fumed silica sprayed by the centrifugal sprayer is large, the telescopic end of the electric push rod contracts, the guide rail, the slide rail and the rack descend, driving the first gear meshed with the rack to rotate, and the rotation of the first gear drives the air outlet nozzle to rotate upward, reducing the inclination of the spiral hot air blown out, realizing an increase in the number of rotation circles of the spiral hot air in the spray dryer, that is, extending the residence time of the fumed silica in the spray drying tank; when the amount of fumed silica sprayed by the centrifugal sprayer is small, the telescopic end of the electric push rod extends, the guide rail, the slide rail and the rack ascend, driving the first gear meshed with the rack to rotate in the reverse direction, and the rotation of the first gear drives the air outlet nozzle to rotate downward, realizing an increase in the inclination of the spiral hot air, reducing the number of rotation circles of the spiral hot air in the spray dryer, that is, shortening the residence time of the fumed silica in the spray drying tank. The present invention is convenient to adjust the residence time of the fumed silica in the spray drying tank according to the amount of fog output by the centrifugal sprayer, ensuring the complete drying of the fumed silica. Description of the Drawings

[0018] Figure 1 This is the front view of a spray drying device for preventing agglomeration of micro-nano fumed silica proposed by the present invention;

[0019] Figure 2 This is a spray drying device for preventing agglomeration of micro-nano fumed silica proposed by the present invention Figure 1 section view;

[0020] Figure 3 This is a spray drying device for preventing agglomeration of micro-nano fumed silica proposed by the present invention Figure 2 three-dimensional structure diagram;

[0021] Figure 4 isFigure 2 Enlarged view of location A

[0022] Figure 5 is Figure 3 Enlarged view of location B

[0023] Figure 6 is the top cross-sectional view of the air outlet nozzle

[0024] Legend: 1. Spray drying tank; 2. U-shaped plate; 3. Air cavity; 4. Air duct; 5. Connection cavity; 6. Rotating shell; 7. Air outlet nozzle; 8. Fan; 9. Vertical air duct; 10. Rack; 11. First gear; 12. Horizontal air duct; 13. Connection block; 14. Pulley; 15. Guide rail; 16. Universal joint; 17. Electric push rod; 18. Second gear; 19. Slide rail Detailed implementation method

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0026] Please refer to Figure 1-6 , the present invention provides a technical solution: a micro-nano silica anti-aggregation spray drying device, including a spray drying tank 1 and a centrifugal sprayer arranged at the top inside the spray drying tank 1. The inner top surface of the spray drying tank 1 is rotatably connected with a rotating shell 6. A plurality of horizontal air ducts 12 are annularly arranged on the side of the rotating shell 6. One end of each horizontal air duct 12 communicates with a vertical air duct 9 that slides along the inner wall of the spray drying tank 1. A plurality of U-shaped plates 2 are fixedly arranged at equal intervals from top to bottom on one side of the vertical air duct 9. One outer side wall of each U-shaped plate 2 is rotatably connected with a first gear 11. One end of the first gear 11 extends into the U-shaped plate 2 and is fixedly connected with an air outlet nozzle 7. The air outlet nozzle 7 is rotatably connected with the inner wall of the U-shaped plate 2, and the air outlet nozzle 7 is internally communicated with the vertical air duct 9 through a hose. A rack 10 that meshes with a plurality of first gears 11 is slidably connected to one side of the vertical air duct 9. The bottom surface of the rack 10 is fixedly connected with a connection block 13. The bottom surface of the connection block 13 is fixedly connected with an annular slide rail 19. The slide rail 19 is sleeved on the guide rail 15. The guide rail 15 rises / falls along the height direction of the spray drying tank 1 according to the amount of the atomized silica ejected by the centrifugal sprayer

[0027] Specifically: the centrifugal sprayer is a common spray drying device, which is used to convert liquid silica into atomized silica, and the control system of the spray drying device is used to adjust the rotation speed of the atomizing disk of the centrifugal sprayer according to the amount of silica solution and technical requirements. The faster the rotation speed of the atomizing disk is, the more the amount of mist output per unit time is, and the slower the rotation speed of the atomizing disk is, the less the amount of mist output per unit time is. At the same time, the control system controls the electric push rod 17. When the amount of mist output of the centrifugal sprayer is large, the telescopic end of the electric push rod 17 is controlled to contract, so that the guide rail 15 is lowered in the height direction of the spray drying tank 1. When the amount of mist output of the centrifugal sprayer is small, the telescopic end of the electric push rod 17 is controlled to extend, so that the guide rail 15 is raised in the height direction of the spray drying tank 1.

[0028] The opening of the rotating shell 6 faces upward and fits the inner top surface of the spray drying tank 1, and the rotating shell 6 can only rotate against the inner top surface of the spray drying tank 1, synchronously driving the horizontal air duct 12 and the vertical air duct 9 to rotate, that is, driving the air in the spray drying tank 1 to rotate in the horizontal direction, and the gear rack 10 is lifted and lowered on the surface of the vertical air duct 9, so that the meshing No. 1 gear 11 can rotate, and the air outlet nozzle 7 can swing up and down. During the swinging process, the air outlet nozzle 7 continuously releases hot air, and along with the rotation of the vertical air duct 9, the air flow on the horizontal plane is guided to gradually tilt, and finally a spiral wind is formed. The angle of the formed spiral wind depends on the inclination of the air outlet nozzle 7. The closer the air outlet nozzle 7 is to the horizontal, the longer the rotation path of the formed spiral wind in the spray drying tank 1 is, that is, the longer the residence time of the atomized white carbon black in the spray drying tank 1 is achieved;

[0029] The provided slide rail 19 facilitates the relative position fixing of the bottom edges of the plurality of vertical air ducts 9 , and through the rotational connection with the guide rail 15 , when the guide rail 15 drives the slide rail 19 to rise and fall, the slide rail 19 can rotate along with the rotation of the vertical air duct 9 .

[0030] In this embodiment, if Figure 2 As shown: an air cavity 3 is provided at the top of the spray drying tank 1, an air duct 4 for connecting to a hot air circulation system is provided on the wall of the air cavity 3, and a connecting cavity 5 communicating with the spray drying tank 1 is provided at the bottom of the air cavity 3, a fan 8 is provided in the air duct 4, a universal joint 16 is provided on one side of the air cavity 3 close to the air duct 4, one end of the universal joint 16 is located in the air cavity 3, and a belt pulley 14 is provided on one end of the universal joint 16 and the fan shaft of the fan 8, the two belt pulleys 14 are driven by belts, the other end of the universal joint 16 extends through the connecting cavity 5 to the rotating shell 6, and is fixedly connected to a No. 2 gear 18 meshing with the inner wall of the rotating shell 6, the fan 8 and one end of the universal joint 16 are both rotatably connected to the wall of the air cavity 3, and the other end of the universal joint 16 is rotatably connected to the inner wall of the connecting cavity 5.

[0031] The function of this embodiment is as follows: The air cavity 3, the air duct 4, and the connection cavity 5 are all components of a common centrifugal atomization type atomizing dryer. When hot air passes through the air duct 4, it drives the fan blades of the fan 8 to rotate, causing the pulley 14 on its fan blade shaft to rotate. Under the connection of the belt, another pulley 14 drives the universal joint 16 to rotate, causing the second gear 18 at the other end of the universal joint 16 to rotate. The contact position between the rotating shell 6 and the second gear 18 can be designed in a toothed ring shape. Therefore, when the second gear 18 rotates, it drives the rotating shell 6 to rotate through meshing connection with the toothed ring;

[0032] Specifically: The universal joint 16 is a WSD type universal coupling, and shafts are installed at both ends. The shafts pass through the air cavity 3 and the connection cavity 5 to ensure the installation position of the universal joint 16.

[0033] In this embodiment, as Figure 3 shown, a filter cotton is embedded in the bottom surface of the outer wall of the horizontal air duct 12. The filter cotton ensures that hot air can pass through. When the horizontal air duct 12 rotates, a wind area is formed in the top area inside the spray drying tank 1, which can prevent the white carbon black mist from contacting the top surface of the spray drying tank 1. And the set filter cotton can effectively reduce the wind speed and prevent the formation of spiral hot air turbulence inside the spray drying tank 1 due to excessive wind speed.

[0034] In this embodiment, as Figure 5 shown: The inner wall cross-section of the guide rail 15 is set in a T shape, and a number of electric push rods 17 for pushing the guide rail 15 to lift are arranged in an annular array at the bottom of the spray drying tank 1.

[0035] In this solution, the electric push rod 17 is preferably a YMD-601100KG type small electric push rod. By the telescopic movement of the telescopic end of the electric push rod 17, the rack 10 is lifted along the surface of the vertical air duct 9.

[0036] A micro-nano white carbon black anti-agglomeration spray drying process includes the following steps:

[0037] S1. Centrifugally process the white carbon black solution through the centrifugal sprayer on the spray drying tank to obtain atomized white carbon black;

[0038] S2. Dry the obtained atomized white carbon black by rotating the vertical air duct 9 and the horizontal air duct 12 and spraying spiral hot air to obtain dried white carbon black particles, and discharge them from the discharge port at the bottom of the spray drying tank 1; The drying process specifically includes the following process;

[0039] When the amount of fumed silica sprayed by the centrifugal sprayer is large, the telescopic end of the electric push rod 17 contracts, and the guide rail 15 descends to drive the slide rail 19 and the rack 10 to descend, so that a number of first gears 11 drive the air outlet nozzle 7 to rotate upward, reducing the inclination of the spiral hot air and increasing the number of rotation circles in the spray dryer 1, that is, the residence time of the fumed silica in the spray drying tank 1 is extended;

[0040] When the amount of fumed silica sprayed by the centrifugal sprayer is small, the telescopic end of the electric push rod 17 extends, and the guide rail 15 ascends to drive the slide rail 19 and the rack 10 to ascend, so that a number of first gears 11 drive the air outlet nozzle 7 to rotate downward, increasing the inclination of the spiral hot air and reducing the number of rotation circles in the spray dryer 1, that is, the residence time of the fumed silica in the spray drying tank 1 is shortened.

[0041] Working process:

[0042] The hot air of the hot air circulation system sequentially enters the rotating shell 6 through the air duct 4, the air cavity 3 and the connecting cavity 5, then enters the horizontal air duct 12 and enters the vertical air duct 9, and finally blows out through the air outlet nozzle 7. When the hot air passes through the air duct 4, it drives the fan blades of the fan 8 to rotate, realizing the rotation of the pulley 14 on its fan blade shaft. Under the connection of the belt, it realizes the rotation of one end of the universal joint 16 driven by another pulley 14. Under the guiding action of the universal joint 16, the other end of the universal joint 16 rotates, that is, the second gear 18 rotates, driving the rotating shell 6 to rotate. The rotating shell 6 rotates to drive the horizontal air duct 12 and the vertical air duct 9 to rotate in the spray drying tank 1, so that the hot air blown out by the air outlet nozzle 7 is spiral. According to the amount of fumed silica mist sprayed by the centrifugal atomizer, the guide rail 15, the slide rail 19 and the rack 10 are lifted and lowered by the lifting of the electric push rod 17, driving the engaged first gear 11 to rotate. The first gear 11 drives the air outlet nozzle 7 to rotate upward / downward, realizing the decrease / increase of the inclination angle of the formed spiral hot air and adjusting the residence time of the fumed silica in the spray drying tank 1.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A micro-nano white carbon black anti-agglomeration spray drying device, comprising a spray drying tank (1) and a centrifugal sprayer arranged at the top inside the spray drying tank (1), characterized in that: A rotating shell (6) is rotatably connected to the inner top surface of the spray drying tank (1). A plurality of transverse air ducts (12) are annularly arranged on the side of the rotating shell (6). One end of each transverse air duct (12) communicates with a vertical air duct (9) that slides along the inner wall of the spray drying tank (1). A plurality of U-shaped plates (2) are fixedly arranged at equal intervals from top to bottom on one side of the vertical air duct (9). A first gear (11) is rotatably connected to an outer side wall of the U-shaped plate (2). One end of the first gear (11) extends into the U-shaped plate (2) and is fixedly connected to an air outlet nozzle (7). The air outlet nozzle (7) is rotatably connected to the inner wall of the U-shaped plate (2), and the air outlet nozzle (7) is internally communicated with the vertical air duct (9) through a hose. Spiral hot air is sprayed by the vertical air duct (9) and the transverse air duct (12) rotating and ejected from the air outlet nozzle (7). A rack (10) meshing with a plurality of first gears (11) is slidably connected to one side of the vertical air duct (9). The bottom surface of the rack (10) is fixedly connected to a connecting block (13). The bottom surface of the connecting block (13) is fixedly connected to an annular slide rail (19). The slide rail (19) is sleeved on a guide rail (15). The guide rail (15) rises / falls along the height direction of the spray drying tank (1) according to the amount of the atomized silica white ejected by the centrifugal sprayer, so as to change the inclination of the spiral hot air.

2. The micro-nano silica anti-aggregation spray drying device according to claim 1, wherein: An air cavity (3) is formed at the inner top of the spray drying tank (1). An air duct (4) for connecting a hot air circulation system is formed in the cavity wall of the air cavity (3), and a connecting cavity (5) communicating with the spray drying tank (1) is formed at the bottom of the air cavity (3).

3. The micro-nano silica anti-agglomeration spray drying device according to claim 2, wherein: A fan (8) is arranged in the air duct (4). A universal joint (16) is arranged on one side of the air cavity (3) close to the air duct (4). One end of the universal joint (16) is located in the air cavity (3). Pulley discs (14) are arranged on one end of the universal joint (16) and the fan blade shaft of the fan (8). The two pulley discs (14) are driven by a belt. The other end of the universal joint (16) extends into the rotating shell (6) through the connecting cavity (5) and is fixedly connected to a second gear (18) meshing with the inner wall of the rotating shell (6).

4. The micro-nano silica anti-agglomeration spray drying device according to claim 3, wherein: One ends of the fan (8) and the universal joint (16) are both rotatably connected through the cavity wall of the air cavity (3). The other end of the universal joint (16) is rotatably connected through the inner wall of the connecting cavity (5).

5. The micro-nano silica anti-aggregation spray drying device according to claim 1, wherein: The cross section of the inner wall of the guide rail (15) is T-shaped, and a plurality of electric push rods (17) for pushing the guide rail (15) to rise and fall are annularly arranged at the bottom of the spray drying tank (1).

6. A spray drying process for preventing agglomeration of micro-nano silica white carbon black, which is applied to the micro-nano silica white carbon black anti-agglomeration spray drying device described in claim 5, and is characterized in that: Including the following steps: S1. The silica white solution is centrifugally treated by a centrifugal sprayer on the spray drying tank to obtain atomized silica white. S2. The obtained atomized silica white is dried by rotating the vertical air duct (9) and the transverse air duct (12) and spraying spiral hot air to obtain dried silica white particles, which are discharged from the discharge port at the bottom of the spray drying tank (1). The drying process specifically includes the following process; When the amount of fumed silica sprayed by the centrifugal sprayer is relatively large, the telescopic end of the electric push rod (17) contracts, and the guide rail (15) descends to drive the slide rail (19) and the rack (10) to descend, driving the first gear (11) engaged with the rack (10) to rotate. The rotation of the first gear (11) drives the air outlet nozzle (7) to rotate upward, reducing the inclination of the spiral hot air blown out, increasing the number of rotation circles of the spiral hot air in the spray drying tank (1), that is, prolonging the residence time of the fumed silica in the spray drying tank (1); When the amount of fumed silica sprayed by the centrifugal sprayer is relatively small, the telescopic end of the electric push rod (17) extends, and the guide rail (15) ascends to drive the slide rail (19) and the rack (10) to ascend, driving the first gear (11) engaged with the rack (10) to rotate in the reverse direction. The rotation of the first gear (11) drives the air outlet nozzle (7) to rotate downward, increasing the inclination of the spiral hot air, reducing the number of rotation circles of the spiral hot air in the spray drying tank (1), that is, shortening the residence time of the fumed silica in the spray drying tank (1).

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